Add some SIL properties for get/await_async_continuation

Author: aschwaighofer

lib/SIL/IR/SILInstruction.cpp

@@ -1105,6 +1105,11 @@ bool SILInstruction::mayRelease() const {
   default:
     llvm_unreachable("Unhandled releasing instruction!");
 
+  case SILInstructionKind::GetAsyncContinuationInst:
+  case SILInstructionKind::GetAsyncContinuationAddrInst:
+  case SILInstructionKind::AwaitAsyncContinuationInst:
+    return false;
+
   case SILInstructionKind::ApplyInst:
   case SILInstructionKind::TryApplyInst:
   case SILInstructionKind::BeginApplyInst:
@@ -1306,6 +1311,12 @@ bool SILInstruction::isTriviallyDuplicatable() const {
   if (isa<DynamicMethodBranchInst>(this))
     return false;
 
+  // Can't duplicate get/await_async_continuation.
+  if (isa<AwaitAsyncContinuationInst>(this) ||
+      isa<GetAsyncContinuationAddrInst>(this) ||
+      isa<GetAsyncContinuationInst>(this))
+    return false;
+
   // If you add more cases here, you should also update SILLoop:canDuplicate.
 
   return true;

lib/SIL/Utils/LoopInfo.cpp

@@ -111,6 +111,11 @@ bool SILLoop::canDuplicate(SILInstruction *I) const {
   if (isa<DynamicMethodBranchInst>(I))
     return false;
 
+  // Can't duplicate get/await_async_continuation.
+  if (isa<AwaitAsyncContinuationInst>(I) ||
+      isa<GetAsyncContinuationAddrInst>(I) || isa<GetAsyncContinuationInst>(I))
+    return false;
+
   // Some special cases above that aren't considered isTriviallyDuplicatable
   // return true early.
   assert(I->isTriviallyDuplicatable() &&

lib/SIL/Utils/MemAccessUtils.cpp

@@ -1980,6 +1980,10 @@ void swift::visitAccessedAddress(SILInstruction *I,
   case SILInstructionKind::UnconditionalCheckedCastAddrInst:
   case SILInstructionKind::UnconditionalCheckedCastValueInst:
   case SILInstructionKind::ValueMetatypeInst:
+  // TODO: Is this correct?
+  case SILInstructionKind::GetAsyncContinuationInst:
+  case SILInstructionKind::GetAsyncContinuationAddrInst:
+  case SILInstructionKind::AwaitAsyncContinuationInst:
     return;
   }
 }